Sasha is the main character's daughter.
When you start the game he only remembers her as a little girl, but when he reaches Abakan Bandit Camp, she is now grown up and part of the bandit group.
She tried to shoot her dad but was hesitant. Boris wounded her and locked her in jail. Her dad then came down to talk. She called him "Judas", a reference to the biblical character Judas, which is usually used to refer to a traitor.
Grown up